Get body of Bad Request httpURLConnection.getInputStream()

I've been working on a portlet that calls Rest API. When the API is called and the requested data doesn't exist, it returns an appropriate error message in JSON format (with Bad request http code - 400), and if the id exists, it returns the requested data in json (with code 200). How can I get the body of response (that contains error description) because invoking `httpConn.getInputStream()` method throws exception in case the response is bad request error. Code: ``` HttpURLConnection httpConn = null; URL url = new URL("http://192.168.1.20/personinfo.html?id=30"); URLConnection connection = url.openConnection(); httpConn = (HttpURLConnection) connection; httpConn.setRequestProperty("Accept", "application/json"); httpConn.setRequestMethod("GET"); httpConn.setRequestProperty("charset", "utf-8"); BufferedReader br = null; if (!(httpConn.getResponseCode() == 400)) { br = new BufferedReader(new InputStreamReader((httpConn.getInputStream()))); String output; StringBuilder builder = new StringBuilder(); System.out.println("Output from Server .... \n"); while ((output = br.readLine()) != null) builder.append(output); return builder.toString(); }else here should catch the error message. :) ```